From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.9 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2A18CC4320A for ; Fri, 6 Aug 2021 16:32:57 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id A0B84611C9 for ; Fri, 6 Aug 2021 16:32:56 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org A0B84611C9 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=suse.cz Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kvack.org Received: by kanga.kvack.org (Postfix) id EC0576B006C; Fri, 6 Aug 2021 12:32:55 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id E70406B0071; Fri, 6 Aug 2021 12:32:55 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id D5EE26B0072; Fri, 6 Aug 2021 12:32:55 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0205.hostedemail.com [216.40.44.205]) by kanga.kvack.org (Postfix) with ESMTP id BB1FE6B006C for ; Fri, 6 Aug 2021 12:32:55 -0400 (EDT) Received: from smtpin19.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id CFA0A1827E91B for ; Fri, 6 Aug 2021 16:32:53 +0000 (UTC) X-FDA: 78445199826.19.3EEC299 Received: from smtp-out1.suse.de (smtp-out1.suse.de [195.135.220.28]) by imf03.hostedemail.com (Postfix) with ESMTP id 4C4C230095CC for ; Fri, 6 Aug 2021 16:32:53 +0000 (UTC) Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by smtp-out1.suse.de (Postfix) with ESMTPS id BE9D1223F7; Fri, 6 Aug 2021 16:32:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_rsa; t=1628267571; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=iPNej9lFt6dK2k5I9jgpntfFoN7CqbJ2BOa04lX6Q+8=; b=wxWDlSJ21OYZs7EoTl7cXt2y5V9xHzSEvWrzFOGTI7YcsJhNZK7ENk25Y+jvyw3sknO7z6 zgmpvIsZVucZM9cB7ULQqd2lmIO/zoSKlBZHjPAMj7wIzFxL/ivSS00H5fmPfHk/Gy/4zT hvOt/iqdSKLUA2QNWFsKIlkSwO7yCLE= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_ed25519; t=1628267571; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=iPNej9lFt6dK2k5I9jgpntfFoN7CqbJ2BOa04lX6Q+8=; b=WhoOmzvyvfhoS3zCSaKGc41C3UthceVWf4sqy3TTVdMZNyEd3t2T5EFKfSdtOZLO0y7VM1 H5/1UsX7Uw4KAjCA== Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by imap2.suse-dmz.suse.de (Postfix) with ESMTPS id 943CB13A96; Fri, 6 Aug 2021 16:32:51 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id gVJJIzNkDWFBaAAAMHmgww (envelope-from ); Fri, 06 Aug 2021 16:32:51 +0000 Subject: Re: [RFC PATCH 00/15] Make MAX_ORDER adjustable as a kernel boot time parameter. To: Zi Yan , David Hildenbrand , linux-mm@kvack.org Cc: Matthew Wilcox , "Kirill A . Shutemov" , Mike Kravetz , Michal Hocko , John Hubbard , linux-kernel@vger.kernel.org References: <20210805190253.2795604-1-zi.yan@sent.com> From: Vlastimil Babka Message-ID: <0d374eed-cc52-a656-b338-1156782bdf7e@suse.cz> Date: Fri, 6 Aug 2021 18:32:15 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: <20210805190253.2795604-1-zi.yan@sent.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Authentication-Results: imf03.hostedemail.com; dkim=pass header.d=suse.cz header.s=susede2_rsa header.b=wxWDlSJ2; dkim=pass header.d=suse.cz header.s=susede2_ed25519 header.b=WhoOmzvy; spf=pass (imf03.hostedemail.com: domain of vbabka@suse.cz designates 195.135.220.28 as permitted sender) smtp.mailfrom=vbabka@suse.cz; dmarc=none X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 4C4C230095CC X-Stat-Signature: bbicpwn4ixnzmdreft5efqp38nsthi9c X-HE-Tag: 1628267573-643729 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 8/5/21 9:02 PM, Zi Yan wrote: > From: Zi Yan > > Hi all, > > This patchset add support for kernel boot time adjustable MAX_ORDER, so that > user can change the largest size of pages obtained from buddy allocator. It also > removes the restriction on MAX_ORDER based on SECTION_SIZE_BITS, so that > buddy allocator can merge PFNs across memory sections when SPARSEMEM_VMEMMAP is > set. It is on top of v5.14-rc4-mmotm-2021-08-02-18-51. > > Motivation > === > > This enables kernel to allocate 1GB pages and is necessary for my ongoing work > on adding support for 1GB PUD THP[1]. This is also the conclusion I came up with > after some discussion with David Hildenbrand on what methods should be used for > allocating gigantic pages[2], since other approaches like using CMA allocator or > alloc_contig_pages() are regarded as suboptimal. I see references [1] [2] etc but no list of links at the end, did you forgot to include?